66157690 has 8 divisors (see below), whose sum is σ = 119083860. Its totient is φ = 26463072.

The previous prime is 66157687. The next prime is 66157697. The reversal of 66157690 is 9675166.

It can be written as a sum of positive squares in 2 ways, for example, as 66048129 + 109561 = 8127^2 + 331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66157690² = 8753679892272200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66157697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3307875 + ... + 3307894.

Almost surely, 2^66157690 is an apocalyptic number.

66157690 is a deficient number, since it is larger than the sum of its proper divisors (52926170).

66157690 is a wasteful number, since it uses less digits than its factorization.

66157690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615776.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 66157690 is about 8133.7377631689. The cubic root of 66157690 is about 404.4455961461.

The spelling of 66157690 in words is "sixty-six million, one hundred fifty-seven thousand, six hundred ninety".